Small lump under knee (DD5) worried!!!!!

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Hello,
Recently noticed a small lump just near DDs knee. It's about the size of a pea and moves under the skin when pressed. She said it doesn't hurt or bother her at all. She's very active and loves climbing and outdoors so we're thinking she has bumped it. Doctors appointment tomorrow morning in any case. I am worried sick though!!Anyone else had anything similar? My mum (who has some medical experience) says it feels as if it's attached to the tendon. Just feel anxious about it!!

Dd1 had a ganglion on the knee at about that age. It was really obvious when she bent her knee-more marble sized.

Possibly a ganglion or an inflamed bursa, it's very unlikely to be anything to worry about in an otherwise well child so please try not to worry.

Thank you
She is otherwise well, fit and active. Trying not to worry. Many thanks